
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" lang="zh_CN">
  <head>
    <meta http-equiv="X-UA-Compatible" content="IE=Edge" />
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>stringprep --- Internet String Preparation &#8212; Python 3.7.3 文档</title>
    <link rel="stylesheet" href="../_static/pydoctheme.css" type="text/css" />
    <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
    
    <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
    <script type="text/javascript" src="../_static/jquery.js"></script>
    <script type="text/javascript" src="../_static/underscore.js"></script>
    <script type="text/javascript" src="../_static/doctools.js"></script>
    <script type="text/javascript" src="../_static/language_data.js"></script>
    <script type="text/javascript" src="../_static/translations.js"></script>
    
    <script type="text/javascript" src="../_static/sidebar.js"></script>
    
    <link rel="search" type="application/opensearchdescription+xml"
          title="在 Python 3.7.3 文档 中搜索"
          href="../_static/opensearch.xml"/>
    <link rel="author" title="关于这些文档" href="../about.html" />
    <link rel="index" title="索引" href="../genindex.html" />
    <link rel="search" title="搜索" href="../search.html" />
    <link rel="copyright" title="版权所有" href="../copyright.html" />
    <link rel="next" title="readline --- GNU readline interface" href="readline.html" />
    <link rel="prev" title="unicodedata --- Unicode 数据库" href="unicodedata.html" />
    <link rel="shortcut icon" type="image/png" href="../_static/py.png" />
    <link rel="canonical" href="https://docs.python.org/3/library/stringprep.html" />
    
    <script type="text/javascript" src="../_static/copybutton.js"></script>
    <script type="text/javascript" src="../_static/switchers.js"></script>
    
    
    
    <style>
      @media only screen {
        table.full-width-table {
            width: 100%;
        }
      }
    </style>
 

  </head><body>  
    <div class="related" role="navigation" aria-label="related navigation">
      <h3>导航</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../genindex.html" title="总目录"
             accesskey="I">索引</a></li>
        <li class="right" >
          <a href="../py-modindex.html" title="Python 模块索引"
             >模块</a> |</li>
        <li class="right" >
          <a href="readline.html" title="readline --- GNU readline interface"
             accesskey="N">下一页</a> |</li>
        <li class="right" >
          <a href="unicodedata.html" title="unicodedata --- Unicode 数据库"
             accesskey="P">上一页</a> |</li>
        <li><img src="../_static/py.png" alt=""
                 style="vertical-align: middle; margin-top: -1px"/></li>
        <li><a href="https://www.python.org/">Python</a> &#187;</li>
        <li>
          <span class="language_switcher_placeholder">zh_CN</span>
          <span class="version_switcher_placeholder">3.7.3</span>
          <a href="../index.html">文档</a> &#187;
        </li>

          <li class="nav-item nav-item-1"><a href="index.html" >Python 标准库</a> &#187;</li>
          <li class="nav-item nav-item-2"><a href="text.html" accesskey="U">文本处理服务</a> &#187;</li>
    <li class="right">
        

    <div class="inline-search" style="display: none" role="search">
        <form class="inline-search" action="../search.html" method="get">
          <input placeholder="快速搜索" type="text" name="q" />
          <input type="submit" value="转向" />
          <input type="hidden" name="check_keywords" value="yes" />
          <input type="hidden" name="area" value="default" />
        </form>
    </div>
    <script type="text/javascript">$('.inline-search').show(0);</script>
         |
    </li>

      </ul>
    </div>    

    <div class="document">
      <div class="documentwrapper">
        <div class="bodywrapper">
          <div class="body" role="main">
            
  <div class="section" id="module-stringprep">
<span id="stringprep-internet-string-preparation"></span><h1><a class="reference internal" href="#module-stringprep" title="stringprep: String preparation, as per RFC 3453"><code class="xref py py-mod docutils literal notranslate"><span class="pre">stringprep</span></code></a> --- Internet String Preparation<a class="headerlink" href="#module-stringprep" title="永久链接至标题">¶</a></h1>
<p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.7/Lib/stringprep.py">Lib/stringprep.py</a></p>
<hr class="docutils" />
<p>When identifying things (such as host names) in the internet, it is often
necessary to compare such identifications for &quot;equality&quot;. Exactly how this
comparison is executed may depend on the application domain, e.g. whether it
should be case-insensitive or not. It may be also necessary to restrict the
possible identifications, to allow only identifications consisting of
&quot;printable&quot; characters.</p>
<p><span class="target" id="index-0"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc3454.html"><strong>RFC 3454</strong></a> defines a procedure for &quot;preparing&quot; Unicode strings in internet
protocols. Before passing strings onto the wire, they are processed with the
preparation procedure, after which they have a certain normalized form. The RFC
defines a set of tables, which can be combined into profiles. Each profile must
define which tables it uses, and what other optional parts of the <code class="docutils literal notranslate"><span class="pre">stringprep</span></code>
procedure are part of the profile. One example of a <code class="docutils literal notranslate"><span class="pre">stringprep</span></code> profile is
<code class="docutils literal notranslate"><span class="pre">nameprep</span></code>, which is used for internationalized domain names.</p>
<p>The module <a class="reference internal" href="#module-stringprep" title="stringprep: String preparation, as per RFC 3453"><code class="xref py py-mod docutils literal notranslate"><span class="pre">stringprep</span></code></a> only exposes the tables from <span class="target" id="index-1"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc3454.html"><strong>RFC 3454</strong></a>. As these
tables would be very large to represent them as dictionaries or lists, the
module uses the Unicode character database internally. The module source code
itself was generated using the <code class="docutils literal notranslate"><span class="pre">mkstringprep.py</span></code> utility.</p>
<p>As a result, these tables are exposed as functions, not as data structures.
There are two kinds of tables in the RFC: sets and mappings. For a set,
<a class="reference internal" href="#module-stringprep" title="stringprep: String preparation, as per RFC 3453"><code class="xref py py-mod docutils literal notranslate"><span class="pre">stringprep</span></code></a> provides the &quot;characteristic function&quot;, i.e. a function that
returns true if the parameter is part of the set. For mappings, it provides the
mapping function: given the key, it returns the associated value. Below is a
list of all functions available in the module.</p>
<dl class="function">
<dt id="stringprep.in_table_a1">
<code class="descclassname">stringprep.</code><code class="descname">in_table_a1</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_a1" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableA.1 (Unassigned code points in Unicode 3.2).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_b1">
<code class="descclassname">stringprep.</code><code class="descname">in_table_b1</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_b1" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableB.1 (Commonly mapped to nothing).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.map_table_b2">
<code class="descclassname">stringprep.</code><code class="descname">map_table_b2</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.map_table_b2" title="永久链接至目标">¶</a></dt>
<dd><p>Return the mapped value for <em>code</em> according to tableB.2 (Mapping for
case-folding used with NFKC).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.map_table_b3">
<code class="descclassname">stringprep.</code><code class="descname">map_table_b3</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.map_table_b3" title="永久链接至目标">¶</a></dt>
<dd><p>Return the mapped value for <em>code</em> according to tableB.3 (Mapping for
case-folding used with no normalization).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_c11">
<code class="descclassname">stringprep.</code><code class="descname">in_table_c11</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c11" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableC.1.1  (ASCII space characters).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_c12">
<code class="descclassname">stringprep.</code><code class="descname">in_table_c12</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c12" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableC.1.2  (Non-ASCII space characters).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_c11_c12">
<code class="descclassname">stringprep.</code><code class="descname">in_table_c11_c12</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c11_c12" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableC.1  (Space characters, union of C.1.1 and
C.1.2).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_c21">
<code class="descclassname">stringprep.</code><code class="descname">in_table_c21</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c21" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableC.2.1  (ASCII control characters).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_c22">
<code class="descclassname">stringprep.</code><code class="descname">in_table_c22</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c22" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableC.2.2  (Non-ASCII control characters).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_c21_c22">
<code class="descclassname">stringprep.</code><code class="descname">in_table_c21_c22</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c21_c22" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableC.2  (Control characters, union of C.2.1 and
C.2.2).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_c3">
<code class="descclassname">stringprep.</code><code class="descname">in_table_c3</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c3" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableC.3  (Private use).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_c4">
<code class="descclassname">stringprep.</code><code class="descname">in_table_c4</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c4" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableC.4  (Non-character code points).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_c5">
<code class="descclassname">stringprep.</code><code class="descname">in_table_c5</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c5" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableC.5  (Surrogate codes).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_c6">
<code class="descclassname">stringprep.</code><code class="descname">in_table_c6</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c6" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableC.6  (Inappropriate for plain text).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_c7">
<code class="descclassname">stringprep.</code><code class="descname">in_table_c7</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c7" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableC.7  (Inappropriate for canonical
representation).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_c8">
<code class="descclassname">stringprep.</code><code class="descname">in_table_c8</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c8" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableC.8  (Change display properties or are
deprecated).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_c9">
<code class="descclassname">stringprep.</code><code class="descname">in_table_c9</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_c9" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableC.9  (Tagging characters).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_d1">
<code class="descclassname">stringprep.</code><code class="descname">in_table_d1</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_d1" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableD.1  (Characters with bidirectional property
&quot;R&quot; or &quot;AL&quot;).</p>
</dd></dl>

<dl class="function">
<dt id="stringprep.in_table_d2">
<code class="descclassname">stringprep.</code><code class="descname">in_table_d2</code><span class="sig-paren">(</span><em>code</em><span class="sig-paren">)</span><a class="headerlink" href="#stringprep.in_table_d2" title="永久链接至目标">¶</a></dt>
<dd><p>Determine whether <em>code</em> is in tableD.2  (Characters with bidirectional property
&quot;L&quot;).</p>
</dd></dl>

</div>


          </div>
        </div>
      </div>
      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
        <div class="sphinxsidebarwrapper">
  <h4>上一个主题</h4>
  <p class="topless"><a href="unicodedata.html"
                        title="上一章"><code class="docutils literal notranslate"><span class="pre">unicodedata</span></code> --- Unicode 数据库</a></p>
  <h4>下一个主题</h4>
  <p class="topless"><a href="readline.html"
                        title="下一章"><code class="docutils literal notranslate"><span class="pre">readline</span></code> --- GNU readline interface</a></p>
  <div role="note" aria-label="source link">
    <h3>本页</h3>
    <ul class="this-page-menu">
      <li><a href="../bugs.html">提交 Bug</a></li>
      <li>
        <a href="https://github.com/python/cpython/blob/3.7/Doc/library/stringprep.rst"
            rel="nofollow">显示源代码
        </a>
      </li>
    </ul>
  </div>
        </div>
      </div>
      <div class="clearer"></div>
    </div>  
    <div class="related" role="navigation" aria-label="related navigation">
      <h3>导航</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../genindex.html" title="总目录"
             >索引</a></li>
        <li class="right" >
          <a href="../py-modindex.html" title="Python 模块索引"
             >模块</a> |</li>
        <li class="right" >
          <a href="readline.html" title="readline --- GNU readline interface"
             >下一页</a> |</li>
        <li class="right" >
          <a href="unicodedata.html" title="unicodedata --- Unicode 数据库"
             >上一页</a> |</li>
        <li><img src="../_static/py.png" alt=""
                 style="vertical-align: middle; margin-top: -1px"/></li>
        <li><a href="https://www.python.org/">Python</a> &#187;</li>
        <li>
          <span class="language_switcher_placeholder">zh_CN</span>
          <span class="version_switcher_placeholder">3.7.3</span>
          <a href="../index.html">文档</a> &#187;
        </li>

          <li class="nav-item nav-item-1"><a href="index.html" >Python 标准库</a> &#187;</li>
          <li class="nav-item nav-item-2"><a href="text.html" >文本处理服务</a> &#187;</li>
    <li class="right">
        

    <div class="inline-search" style="display: none" role="search">
        <form class="inline-search" action="../search.html" method="get">
          <input placeholder="快速搜索" type="text" name="q" />
          <input type="submit" value="转向" />
          <input type="hidden" name="check_keywords" value="yes" />
          <input type="hidden" name="area" value="default" />
        </form>
    </div>
    <script type="text/javascript">$('.inline-search').show(0);</script>
         |
    </li>

      </ul>
    </div>  
    <div class="footer">
    &copy; <a href="../copyright.html">版权所有</a> 2001-2019, Python Software Foundation.
    <br />
    Python 软件基金会是一个非盈利组织。
    <a href="https://www.python.org/psf/donations/">请捐助。</a>
    <br />
    最后更新于 4月 09, 2019.
    <a href="../bugs.html">发现了问题</a>？
    <br />
    使用<a href="http://sphinx.pocoo.org/">Sphinx</a>1.8.4 创建。
    </div>

  </body>
</html>